pyrethrin
[ pahy-ree-thrin, -reth-rin ]
/ paɪˈri θrɪn, -ˈrɛθ rɪn /
noun Chemistry.
Also called pyrethrin I.
a viscous, water-insoluble liquid, C21H28O3, extracted from pyrethrum flowers, used as an insecticide.
Also called pyrethrin II.
a like compound, C22H28O5, obtained and used similarly.
Origin of pyrethrin
First recorded in 1830–40;
pyrethr(um) +
-in2
Words nearby pyrethrin
pyrenean,
pyrenean mountain dog,
pyrenees,
pyrenocarp,
pyrenoid,
pyrethrin,
pyrethroid,
pyrethrum,
pyretic,
pyreto-,
pyretogenesis
British Dictionary definitions for pyrethrin
pyrethrin
/ (paɪˈriːθrɪn) /
noun
Also called: pyrethrin I
an oily water-insoluble compound used as an insecticide. Formula: C 21 H 28 O 3
Also called: pyrethrin II
a compound of similar chemical structure and action, also found in pyrethrum. Formula: C 22 H 28 O 5
Word Origin for pyrethrin
C19: from
pyrethrum +
-in